[1] Jagiellonian Univ Med Coll, Med Fac, Chair Epidemiol & Prevent Med, Lab Res Aging Soc, Ul Skawinska 8, PL-31066 Krakow, Poland
[2] Vrije Univ Brussel VUB, End Of life Care Res Grp, Brussels, Belgium
[3] Univ Ghent, Brussels, Belgium
[4] Ghent Univ Hosp, Dept Geriatr Med, Ghent, Belgium
[5] Finnish Inst Hlth & Welf, Helsinki, Finland
[6] Univ Cattolica Sacro Cuore, Fdn Policlin Univ Agostino Gemelli, Dipartimento Med & Chirurg Traslaz, IRCCS, Rome, Italy
[7] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Philadelphia, PA USA
[8] Vrije Univ Amsterdam, Expertise Ctr Palliat Care, Dept Publ & Occupat Hlth, Amsterdam UMC, Amsterdam, Netherlands
[9] Univ Hosp, Geriatr Outpatient Dept, Krakow, Poland